A little over two weeks after the commencement of the First World War, the Catholic Church was left without its universal shepherd at a time of immense upheaval. Pope Pius X died on 20 August 1914 and immediately, the cardinals of the Catholic Church made their way to Rome to elect his successor. In the conclave, the choice fell on Giacomo della Chiesa, Cardinal Archbishop of Bologna, who took the name of Benedict XV. Della Chiesa had been a student of Cardinal Mariano Rampolla, the Secretary of State under Leo XIII. His essential training had been in diplomacy and this made him well qualified to cope with the war. Immediately upon his accession, Benedict adopted a policy of impartiality and advocated an immediate peace by negotiation. His various peace efforts were ignored, however, and many Catholics in various European countries gave only lukewarm support or made clear an outright rejection of the Pope’s pronouncements on diplomacy. This article concentrates on the reaction of British Catholics, in particular, to Benedict XV’s peace appeals during the war, including his Peace Note of 1917.